Low Kick doesn't have a standard power; rather, it inflicts greater damage on a heavier target. Low Kick's power is calculated as follows (note that Game Freak used weight in kilograms for all the cutoffs):

Trivia

This move is the second to have their English name be used as a Japanese name for another move, as "Low Kick" is used as the Japanese name for Low Sweep. The first is Comet Punch, whose name was used for the Japanese name of Meteor Mash.